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Topic under PLC (Programmable Logic Controller)Source: www.prosoft.ru File size:1.1 MBFile type:pdfLast download on:
Sun Apr 15, 2018 03:30:31 PMShort Desciption:
This manual will help you when selecting, configuring, and assigning parameters to
a controller block for your control task.
The manual introduces you to the functions of the configuration tool and explains
how you use it.

Summary:
The software product ”Standard PID Control” essentially consists of two function
blocks (FBs) which contain the algorithms for generating control and
signal-processing functions for continuous or step controllers. It is a pure software
control in which a standard function block incorporates the functionality of the
controller.
The behavior of the controller itself and the properties of the functions in the
measuring and adjusting channel are realized or simulated by means of the
numberic algorithms of the function block. The data required for these cyclic
calculations are saved in control-loop-specific data blocks. An FB is only required
once to create several controllers.
Every controller is represented by an instance DB which must be created
application-specifically. When the ”Standard PID Control Tool” is used, this DB is
created ’implicitly. This means that the design of a specific controller is limited to
specifying the structural and value parameters in the editing windows of the user
interface. The instance DB is created by the configuration tool.
The calculation of the algorithms for a certain controller is carried out in the
processor of the S7 automation system (AS) in the set time intervals (sampling
times). The calculation results and thus the updated values of the input and output
variables (measuring and manipulated variables) and status signals (limits) are
stored in the corresponding instance DB or transferred to the process periphery.
In order to process several control loops which are to be executed at different
intervals – but equidistantly – depending on the inertia of the respective process, a
controller call distribution function (Loop Scheduler = LP_SCHED) is available
through which the configuration of extensive plant controls becomes structured and
thus simple. In addition, even utilization of the CPU is ensured.
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